Emerson 1F97-1277 User Manual

Big Blue Touchscreen Thermostat with

CAUTION

!

Automatic Heat/Cool Changeover Option

Installation and Operating Instructions for Model:

Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS
CAREFULLY BEFORE INSTALLING OR OPERATING THIS
CONTROL COULD CAUSE PERSONAL INJURY AND/OR
PROPERTY DAMAGE.

Model Programming Choices

1F97-1277

Non-Programmable 5+1+1 Day 7 Day

APPLICATIONS

THERMOSTAT APPLICATION GUIDE

Description

Heat Pump (No Aux. or Emergency Heat) Yes
Heat Pump (with Aux. or Emergency Heat) Yes
Systems with up to 3 Stages Heat, 2 Stages Cool No
Heat Only Systems Yes
Millivolt Heat Only Systems – Floor or Wall Furnaces Yes
Cool Only Systems Ye s
Gas or Oil Heat Yes
Electric Furnace Yes
Hydronic (Hot Water) Zone Heat – 2 Wires Ye s
Hydronic (Hot Water) Zone Heat – 3 Wires Ye s
Wired Remote Temperature Sensor (Indoor/Outdoor) Yes

Dual Fuel Feature (Heat Pump Mode) Yes

1F97-1277 Touchscreen Thermostat

SPECIFICATIONS

Electrical Rating:

Battery Power.......................... mV to 30 VAC, NEC Class II, 50/60 Hz or DC

Input-Hardwire ......................... 20 to 30 VAC

Terminal Load ............................. 1.5A per terminal, 2.5A maximum all terminals combined

Setpoint Range ............................ 45 to 99°F (7 to 37°C)

Differential (Single Stage) .................... Heat 0.6°F; Cool 1.2°F

Differential (Multi-Stage) ..................... Heat 0.6°F; Cool 1.2°F

Differential (Heat Pump) ..................... Heat 1.2°F; Cool 1.5°F

Operating Ambient.......................... 32°F to +105°F (0 to +41°C)

Operating Humidity ......................... 90% non-condensing max.

Shipping Temperature Range ................. -4 to +150°F (-20 to +65°C)

Dimensions Thermostat...................... 4-9/16"H x 5-13/16"W x 1-3/16"D

To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.

Index Page

Installation 2
Wiring Connections 2
Thermostat Quick Reference 4
Installer Conguration Menu 5
Operating Your Thermostat 8
Programming 9
Troubleshooting 12

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www.emersonclimate.com

ATTENTION: MERCURY NOTICE

This product does not contain mercury. However, this
product may replace a product that contains mercury.

Mercury and products containing mercury must not be
discarded in household trash. Do not touch any spilled
mercury. Wearing non-absorbent gloves, clean up any
spilled mercury and place in a sealed container. For proper
disposal of a product containing mercury or a sealed
container of spilled mercury, place it in a suitable shipping
container. Refer to www.thermostat-recycle.org for
location to send the product containing mercury.

PART NO. 37-7388A

1241

2 "AA" Batteries

INSTALLATION

Mounting

Hole

Mounting

Hole

Place Level
across
Mounting Tabs
(for appearance only)

Place Level

across

Mounting Tabs

(for appearance only)

+

S

-

W/E

6

L

WARNING

!

Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.

Remove Old Thermostat

A standard heat/cool thermostat consists of three basic parts:

1. The cover, which may be either a snap-on or hinge type.

2. The base, which is removed by loosening all captive
screws.

3. The switching subbase, which is removed by unscrewing

the mounting screws that hold it on the wall or adapter
plate. Before removing wires from old thermostat,

label each wire with the terminal designation from
which it was attached. Disconnect the wires from the old

thermostat one at a time. Do not let wires fall back into
the wall.

Battery Location

2 "AA" alkaline batteries are included in the thermostat at
the factory with a battery tag to prevent power drainage.
Remove the battery tag to engage the batteries.
To replace batteries, set system to OFF, remove thermostat
from wall and install the batteries in the rear along the top of
the thermostat (see Figure 1).

Figure 1 – Thermostat Base Multi-Stage 1F97-1277

Installing New Thermostat

1. Pull the thermostat body off the thermostat base. Forcing

or prying on the thermostat will cause damage to the unit.

2. Place base over hole in wall and mark mounting hole

locations on wall using base as a template.

3. Move base out of the way. Drill mounting holes. If you

are using existing mounting holes and the holes drilled
are too large and do not allow you to tighten base snugly,

use plastic screw anchors to secure the base.

4. Fasten base snugly to wall using mounting holes shown

in Figure 1 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.

5. Connect wires to terminal block on base using appropriate
wiring schematic (see diagrams on next page).

6. Push excess wire into wall and plug hole with a re resis­tant material (such as berglass insulation) to prevent

drafts from affecting thermostat operation.

7. Carefully line the thermostat up with the base and snap

into place.

WIRING CONNECTIONS

Refer to equipment manufacturers' instructions for specic

system wiring information. After wiring, see CONFIGURA-

TION section for proper thermostat conguration.

Rear view of thermostat

For wiring diagrams, see next page.
Wiring diagrams shown are for typical systems and describe
the thermostat terminal functions.

TERMINAL DESIGNATION DESCRIPTIONS

Terminal Designation Description

B ...................Changeover valve for heat pump energized constantly in heating

O ...................Changeover valve for heat pump energized constantly in cooling

Y ...................Compressor Relay

G ...................Fan Relay

RC...................Power for Cooling

RH...................Power for Heating

C ...................Common wire from secondary side of cooling

L ...................For Call for Service indicator for systems with diagnostic connection

6 ...................Powered closed connection for 3-wire zone valve

W ...................Heat Relay

-....................Common (DC) for wired remote temperature sensor

S ...................Frequency signal from remote temperature sensor

+ ...................Power (DC) to remote temperature sensor

2

WIRING CONNECTIONS

To Remote Te mperature Sensor

HEATING

To Remote Temperature Sensor

Single Stage Connections

Refer to equipment manufacturers' instructions for specic system

wiring information.
This thermostat is designed to operate a single-transformer or two­transformer system.

You can congure the thermostat for use with the following systems:

Single Stage System with Single Transformer

To Remote Te mperature Sensor

Jumper

B

120VAC

TRANSFORMER

System

Single
Stage

(SS)

CLASS II

Energized
in Heat
or Off
Mode

System

Single
Stage

(SS)

NEUTRAL

24VAC

HOT

Energiz­ed in
Cool
Mode

B

Energized
in Heat,
Off Mode

O

Energized
on call
for Cool
(Com­pressor)

O

Energized
in Cool
Mode

Y

Remove Jumper Wire
between RH & RC

Energized
on call
for Cool
(Com­pressor)

G

Blower/
Circula­tor Fan
Energiz­ed on
call for
Cool &
for Heat
(if ELE
is sel­ected)

Y

RC

RH

C*

DC
supply

24 Volt

voltage

Com-

24 Volt

24 Volt
(Hot)
Cool

(Hot)
Heat

mon
(option­al)

to re­mote
Temp­erature
Sensor

*Common connection required for fault or
malfunction indication and remote sensor.

Single Stage with Two Transformers

Jumper

RC

24 Volt
(Hot)
Cool

RH

C*

24 Volt
Com-

24 Volt

mon

(Hot)

(option-

Heat

al)

*Common connection required for fault or
malfunction indication and remote sensor.

G

Blower/
Circula­tor Fan
Energiz­ed on
call for
Heat or
Cool
(if ELE
is sel­ected)

SINGLE STAGE gas, oil or electric.

HEAT PUMP TYPE 1 (HP 1). Single stage compressor system; gas

or electric backup.

After wiring, see INSTALLER CONFIGURATION section for proper

thermostat conguration.

{

+

S

-

Remote
Temp­erature
Sensor
signal

DC
Return
to
Remote
Temp­erature
Sensor

W

Energized
on call for
Heat

6

Third
wire for
3-wire
zone
valve

L

Diagnostic
Indicator
(See

1

Note

)

NEUTRAL

24VAC

HOT

CLASS II

TRANSFORMER

120VAC

{

NOTE: If continuous backlight or hardwired
power input are desired but do not function

+

DC
supply
voltage
to re­mote
Temp­erature
Sensor

S

Remote
Temp­erature
Sensor
signal

-

DC
Return
to
Remote
Temp­erature
Sensor

W

Energized
on call for
Heat

6

Third wire
for 3-wire
zone valve

Diagnostic
Indicator
(See
Note

in both HEAT and COOL modes, cut the

L

heating transformer 24V wires and tape off.
Connect the neutral circuit disconnected
from the heating transformer to the neutral
circuit of the cooling transformer. Discon­nect the wire to the RH terminal and install
a jumper between RH and RC. Depending
on the system requirements, replace the

1

)

cooling transformer with a 75VA class II
transformer if needed.

NEUTRAL

24VAC

HOT

CLASS II

TRANSFORMER

120VAC

COOLING

Heat Pump Systems

{

Jumper

B

System

Heat
Pump 1
(HP1)

Energiz­ed in
Heat/
Emer­gency
Mode

O

Energized
in Cool
& Off
Mode

Y

1st
Stage
Heat
& Cool
(Com­pressor)
**

RC

G

Blower/
Circula­tor Fan

24 VAC

Energiz-

(Hot)

ed on

Cool

call for
Heat or
Cool

RH

24 VAC
(Hot)
Heat

24 VAC
Common
(optional)

NOTE ➀: Connection for Call for Service diagnostic indicator compatible with mechanical or electronic condenser control with Comfort AlertTM.

+

C*

DC
supply
voltage
to re­mote
Temp­erature
Sensor

S

Remote
Temp­erature
Sensor
signal

-

DC
Return
to
Remote
Temp­erature
Sensor

W

Auxil­iary &
Emer­gency
Heat
1st
Stage

6

Power
Closed
Conn­ection
for
3-wire
zone
valve

L

Diagnostic
Indicator
(See
Note )

Comfort
Alert II module
or similar
malfunction
module

NEUTRAL

24VAC

HOT

TRANSFORMER

*24 VAC common connection
optional for system operation.

Required for fault or malfunction indi-

cation, remote temperature sensor, or

for continuous backlight operation.

**Dual fuel de-energizes

compressor when auxiliary heat is

energized.

120VAC

CLASS II

3

1

2

3

4

5

6

7

8

9

10

11

12

Time of Day

Day of Week

Room
Temperature

System
Switch

Fan
Switch

Indicates when
thermostat is calling
for Heat or Cool

Battery Level Indicator
Indicating the current power level
of the 2 “AA” batteries.
Full power remaining.
Half power remaining.

Change The batteries should be replaced at this time.

Menu key for entering

different modes such as
Configuration, Set Time,
Set Schedule and Cleaning

Enters user-friendly
program into
the schedule

Temperature
UP/Down used for
modifying set point
as well as to
navigating the menus

Set Temperature

THERMOSTAT QUICK REFERENCE

13

14

15

16

16

15

14

13

12

11

10

9

8

76

54

3

2

1

Home Screen Description

Figure 2 – Home Screen Display

Programming and Conguration Items

Displays and "Keypad Lockout" when in keypad

lockout mode.
Displays
Lockout" when limited range is activated and locked.
Displays only "Temperature Limit" when limited range
is activated.

Indicates period of day being programmed.

RUN SCHEDULE (run program) button.

SET TIME button or HOLD temperature button.

Displays "Change Filter" when the system has run

for the programmed lter time period as a reminder to
change or clean your lter.

COPY button or INSTALLER CONFIG button.

CLEAN DISPLAY button allows 30 seconds to wipe off

the display or ADVANCE DAY button for programming.

Used in programming to set time and in conguration

menu to change selections.

"Hold Until" indicates the time when a temporary hold

period will end.

"Hours" and "Days" displays during steps in installer

conguration.

The words "Hold At" are displayed when the thermo-

stat is in the HOLD mode. "Temporary Hold At" is
displayed when the thermostat is in a temporary HOLD
mode.

"Call For Service" indicates a fault in the heating/cool-

ing system. It does not indicate a fault in the thermostat.

4

and "Temperature Limit" and "Keypad

Figure 3 – Programming & Conguration Items

"System On" indicates when heating or cooling stage

is energized.

"Copy" indicates the copy program feature is being

used during programming.

A steady "Cool Savings" display indicates the feature

is enabled in the installer menu. A ashing "Cool Sav­ings" display indicates the feature is active.

"Remote" indicates that the indoor remote temperature

sensor, is being accessed. "Outdoor Remote" indi­cates the outdoor remote temperature sensor is being
accessed.